I had the same problem and the renaming and/or copying didn't work either.
After searching some more on Cognos.com I found they suggest that the file may be locked by a virus-scanner and to exclude the Cognos-files (mdl,mdc,pyi,qyi) from being scanned by that scanner. (KnowledgeBase 1003996)...
I'm looking for a way to calculate the result of a string. For example, after several steps the string looks like this "12 + 523.23 / 8 * 5". Now I am looking for probably a DLL that I can give this string to and that will give me back the result. The way progress does it in it example...
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